softthresh.m

去噪工具包

function x = SoftThresh(y,t)
% SoftThresh -- Apply Soft Threshold 
%  Usage 
%    x = SoftThresh(y,t)
%  Inputs 
%    y     Noisy Data 
%    t     Threshold
%  Outputs 
%    x     sign(y)(|y|-t)_+
%
	res = (abs(y) - t);
	res = (res + abs(res))/2;
	x   = sign(y).*res;

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% Copyright (c) 1993-5.  Jonathan Buckheit, David Donoho and Iain Johnstone
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% Part of WaveLab Version 802
% Built Sunday, October 3, 1999 8:52:27 AM
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